<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .bb, .bb::before, .bb::after {
      position: absolute;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
    }
    .bb {
      width: 200px;
      height: 200px;
      margin: auto;
      background: url("https://www.22vd.com/kefu/cn_2.png") no-repeat 50%/70% rgba(0, 0, 0, 0.1);
      color: #69ca62;
      box-shadow: inset 0 0 0 1px rgba(105, 202, 98, 0.5);
    }
    .bb::before, .bb::after {
      content: '';
      z-index: -1;
      margin: -5%;
      box-shadow: inset 0 0 0 2px;
      animation: clipMe 8s linear infinite;
    }
    .bb::before {
      animation-delay: -4s;
    }
    .bb:hover::after, .bb:hover::before {
      background-color: rgba(255, 0, 0, 0.3);
    }

    @keyframes clipMe {
      0%, 100% {
        clip: rect(0px, 220.0px, 2px, 0px);
      }
      25% {
        clip: rect(0px, 2px, 220.0px, 0px);
      }
      50% {
        clip: rect(218.0px, 220.0px, 220.0px, 0px);
      }
      75% {
        clip: rect(0px, 220.0px, 220.0px, 218.0px);
      }
    }
  </style>
</head>
<body>
  <div class="bb"></div>
</body>
</html>